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ISO/TR 15608 ISO/TR 15608 Material Group 7.2

ISO/TR 15608 Material Group 7.2: Martensitic stainless steels with C ≤ 0,35 % and 10,5 % ≤ Cr ≤ 30 %;

Martensitic stainless steels are similar to low alloy or carbon steels. In the annealed condition they have a structure similar to the ferritics, but when hardened they have a ‘body-centred tetragonal’, (bct), crystal lattice, rather than a body centred cubic, (bcc), lattice. Due to the deliberate addition of carbon, they can be hardened and strengthened by heat treatment, in a similar way to many carbon/carbon alloy steels. They are classed as a “hard” ferro-magnetic group. The main alloying element is chromium, with a typical content of 12-15%.

Martensitic grades have been developed with nitrogen and nickel additions, but with lower carbon levels than the traditional grades. These steels have improved toughness, weldability and corrosion resistance.

1.4313 and 1.4418. These low carbon martensitic grades have the benefit of being more weldable than other martensitic grades. Poor weldability is normally seen as a downside of martensitic steels due to their generally high carbon content, which requires pre and post heat treatment in welding. These steels are much better in this respect.

Typical materials in group 7.2

1Name/GradeNumberStandardProductRemarks
F6a, Cl. 1
F6a, Cl. 2
F6a, Cl. 3
F6a, Cl. 4
410
TP410
410
F6
410
S41000
S41000
S41000
S41000
S41000
S41000
S41000
S41000
S41000
ASTM A-182
ASTM A-182
ASTM A-182
ASTM A-182
ASTM A-240
ASTM A-268
ASTM A-276
ASTM A-336
ASTM A-479
Forging
Forging
Forging
Forging
Plate
Smls. & welded tube
Bar
Forging
Bar
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
X2CrNi12
40
1.4003
S41003
EN 10028-7
ASTM A-1010
Plate
Plate

ASME BPVC
410SS41008ASTM A-240PlateASME BPVC
F6bS41026ASTM A-182ForgingASME BPVC
414S41400ASTM A-479BarASME BPVC
F6NM
S41500
S41500
S41500
S41500
S41500
S41500
S41500
S41500
S41500
S41500
ASTM A-182
ASTM A-240
ASTM A-268
ASTM A-479
ASTM A-731
ASTM A-815
Forging
Plate
Smls. & welded tube
Bar
Smls. & welded pipe
Fittings
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
ASME BPVC
F429
429
TP429
S42900
S42900
S42900
ASTM A-182
ASTM A-240
ASTM A-268
Forging
Plate
Smls. & welded tube
ASME BPVC
ASME BPVC
ASME BPVC
CA15
CA15 Cl. C
J91150
J91150
ASTM A-217
ASTM A-487
Casting
Casting
ASME BPVC
ASME BPVC
CA15M Cl. AJ91151ASTM A-487CastingASME BPVC
CA15 Cl. B
CA15 Cl. D
J91171
J91171
ASTM A-487
ASTM A-487
Casting
Casting
ASME BPVC
ASME BPVC
CA6NM
CA6NM Cl. A
CA6NM Cl. B
J91540
J91540
J91540
ASTM A-352
ASTM A-487
ASTM A-487
Casting
Casting
Casting
ASME BPVC
ASME BPVC
ASME BPVC
X3CrNi13-41.4313EN 10222-5ForgingEN 13445-2 & EN 13480-2
X4CrNiMo16-5-11.4418EN 10272BarEN 13445-2 & EN 13480-2
Table: Typical materials